mn10300: add pci_get_legacy_ide_irq() to <asm/pci.h>

Add missing pci_get_legacy_ide_irq() implementation
before it becomes required by core IDE PCI code.

Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/asm-mn10300/pci.h b/include/asm-mn10300/pci.h
index cd9cc5c..0517b45 100644
--- a/include/asm-mn10300/pci.h
+++ b/include/asm-mn10300/pci.h
@@ -121,4 +121,9 @@
 
 #define pcibios_scan_all_fns(a, b)	0
 
+static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
+{
+	return channel ? 15 : 14;
+}
+
 #endif /* _ASM_PCI_H */